Heat Pilot Won't Light

I am on a no heat call where the homeowner couldn't light the pilot. I look into the boiler heater gas burner section to examine the pilot assembly. the thermocouple tip looked burnt and the pilot hood was caked up with white powder. Therefore I clean the pilot assembly and replace the thermocouple. Next, I light the hot water boiler pilot and the thermocouple activates the pilot valve. Finally, I turn the gas valve on and the boiler burners light up.

• #science_technology
• #hvac
• #no_heat
• #heat_not_working
• #pilot_wont_light
• #replace_thermocouple
• #boiler_not_firing
• #burners_not_burning